The application of microwave photon technology is mainly embodied in microwave signal generation, microwave fiber transmission, two-way wireless communication microwave signal processing, radio frequency broadcasting, radar system and so on. The main idea of these applications is to modulate the microwave radio frequency signal on the optical carrier and transmit it through the optical fiber network. The advantages of this method are light weight, low loss, low cost and anti-electromagnetic interference, a high performance, low cost, easy to install and maintain photonic microwave system can be constructed. For Microwave Communications and photonic microwave technology, high-quality microwave signal sources are the basis of all applications in the microwave field,